mirror of
https://github.com/encode/django-rest-framework.git
synced 2024-11-11 04:07:39 +03:00
731443b71e
The `DefaultContentNegotiation` handler uses For example: Google Chrome sends an Accept-header of `Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8`, when I request a *.png URL. After matching the media-types with the available renderers (in my case only a custom `PNGRenderer` with a `media_type='image/png'`), only `*/*;q=0.8` is left, which happens to have the same length as the "image/png" media-type defined by the renderer (9 characters). The specificity of the renderer's media-type over the Accept-header's one is only determined by length. Using your `_MediaType.precedence` would be preferable in my eyes. Regards, Fabian
85 lines
3.5 KiB
Python
85 lines
3.5 KiB
Python
from django.http import Http404
|
|
from rest_framework import exceptions
|
|
from rest_framework.settings import api_settings
|
|
from rest_framework.utils.mediatypes import order_by_precedence, media_type_matches
|
|
from rest_framework.utils.mediatypes import _MediaType
|
|
|
|
|
|
class BaseContentNegotiation(object):
|
|
def select_parser(self, request, parsers):
|
|
raise NotImplementedError('.select_parser() must be implemented')
|
|
|
|
def select_renderer(self, request, renderers, format_suffix=None):
|
|
raise NotImplementedError('.select_renderer() must be implemented')
|
|
|
|
|
|
class DefaultContentNegotiation(BaseContentNegotiation):
|
|
settings = api_settings
|
|
|
|
def select_parser(self, request, parsers):
|
|
"""
|
|
Given a list of parsers and a media type, return the appropriate
|
|
parser to handle the incoming request.
|
|
"""
|
|
for parser in parsers:
|
|
if media_type_matches(parser.media_type, request.content_type):
|
|
return parser
|
|
return None
|
|
|
|
def select_renderer(self, request, renderers, format_suffix=None):
|
|
"""
|
|
Given a request and a list of renderers, return a two-tuple of:
|
|
(renderer, media type).
|
|
"""
|
|
# Allow URL style format override. eg. "?format=json
|
|
format_query_param = self.settings.URL_FORMAT_OVERRIDE
|
|
format = format_suffix or request.GET.get(format_query_param)
|
|
|
|
if format:
|
|
renderers = self.filter_renderers(renderers, format)
|
|
|
|
accepts = self.get_accept_list(request)
|
|
|
|
# Check the acceptable media types against each renderer,
|
|
# attempting more specific media types first
|
|
# NB. The inner loop here isn't as bad as it first looks :)
|
|
# Worst case is we're looping over len(accept_list) * len(self.renderers)
|
|
for media_type_set in order_by_precedence(accepts):
|
|
for renderer in renderers:
|
|
for media_type in media_type_set:
|
|
if media_type_matches(renderer.media_type, media_type):
|
|
# Return the most specific media type as accepted.
|
|
if (_MediaType(renderer.media_type).precedence >
|
|
_MediaType(media_type).precedence):
|
|
# Eg client requests '*/*'
|
|
# Accepted media type is 'application/json'
|
|
return renderer, renderer.media_type
|
|
else:
|
|
# Eg client requests 'application/json; indent=8'
|
|
# Accepted media type is 'application/json; indent=8'
|
|
return renderer, media_type
|
|
|
|
raise exceptions.NotAcceptable(available_renderers=renderers)
|
|
|
|
def filter_renderers(self, renderers, format):
|
|
"""
|
|
If there is a '.json' style format suffix, filter the renderers
|
|
so that we only negotiation against those that accept that format.
|
|
"""
|
|
renderers = [renderer for renderer in renderers
|
|
if renderer.format == format]
|
|
if not renderers:
|
|
raise Http404
|
|
return renderers
|
|
|
|
def get_accept_list(self, request):
|
|
"""
|
|
Given the incoming request, return a tokenised list of media
|
|
type strings.
|
|
|
|
Allows URL style accept override. eg. "?accept=application/json"
|
|
"""
|
|
header = request.META.get('HTTP_ACCEPT', '*/*')
|
|
header = request.GET.get(self.settings.URL_ACCEPT_OVERRIDE, header)
|
|
return [token.strip() for token in header.split(',')]
|